body {
  background-color: #ddd;
}
.box {
  width: 375px;
  margin: 0 auto;
  background-color: #fff;
  padding: 10px;
  font-size: 14px;
  .nav {
    display: flex;
    align-items: center;
    div {
      background-color: #ddd;
      border-radius: 5px;
      padding: 2px 5px;
      &.active {
        background-color: #2c4cdb;
        color: #fff;
      }
      margin-right: 5px;
      cursor: pointer;
    }
  }
  ul {
    display: none;
    padding: 10px 0;
    li {
      color: #2c4cdb;
      line-height: 21px;
    }
    &.active {
      display: block;
    }
  }
}
